#include<stdio.h>
int main() {
	/*printf("%s\n", __FILE__);
	printf("%d\n", __LINE__);
	printf("%s\n", __DATE__);
	printf("%s\n", __TIME__);*/
	int a = 10;
	int b = 20;
	int sum =dd(a,b);
	printf("%d\n", sum);
	return 0;
}